(19)

(11)

EP 0 288 462 A1

(12)

(43) Date of publication: 02.11.1988 Bulletin 1988/44 (21) Application number: 86906601.0 (22) Date of filing: 14.10.1986

(51) International Patent Classification (IPC):  H04M 3/ 00( . ) H04M 7/ 00( . ) H04M 3/ 36( . ) H04Q 3/ 66( . ) (86) International application number: PCT/US1986/002154 (87) International publication number: WO 1987/003763 (18.06.1987 Gazette 1987/13)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 05.12.1985 US 19850805302 (71) Applicant: BELL COMMUNICATIONS RESEARCH, INC. Livingston, New Jersey 07039-2729 (US)	(72) Inventors: KRISHNAN, Komandur, Ramu Bridgewater, NJ 08807 (US) OTT, Teunis, Jan Chester, NJ 07930 (US) (74) Representative: Dubois-Chabert, Guy, et al  Société de Protection des Inventions 25, rue de Ponthieu F-75008 Paris F-75008 Paris (FR)